E(T)(30) solvent polarity scale. Moreover, the dye 1a is a ribonucleoside and hence has the potential application as a polarity probe for application in RNA oligonucleotides. The isomeric dye 6-(pyridinium-1)-yl-9H-purin-2-olate, 2a, has also been synthesized and exhibits slightly smaller solvatochromic band shifts. The new betaine dyes have also been studied by comparing the experimental and calculated
一种新的溶剂化变色
甜菜碱染料是由
黄嘌呤合成的,并通过紫外可见分光光度法在多种溶剂中进行表征。
染料9-(2',3',5'-三-O-乙酰基-β-d-
呋喃核糖基)-2-(
吡啶-1-基)-9H-
嘌呤-6-olate 1a显示溶剂-诱导的光谱带移,是
甜菜碱(被称为莱卡德
染料)的(2)/(3),这是E(T)(30)溶剂极性标度的基础。此外,
染料1a是
核糖核苷,因此具有潜在的应用作为在RNA寡核苷酸中应用的极性探针。异构
染料6-(
吡啶鎓-1)-基-9H-
嘌呤-2-
油酸酯2a也已经合成,并且表现出稍小的溶剂化变色带移。通过使用密度泛函理论(DFT)的方法相结合,基于UV / vis吸收光谱的计算,通过比较实验和计算的溶剂化色移,还研究了新的
甜菜碱染料。使用COSMO连续介质法,哈密顿方程中的施加电场项和时变密度泛函理论(TD-DFT)方法来获得吸收能,基态偶极矩以及地与地之间的偶极矩差兴奋的状态。与实验数